List of Energy Abbreviations - I

I

• I/C—Interruptible /Curtailable (electricity)
• ICAP—Installed Capacity (electricity)
• ICAP-SCR—Installed capacity special case resources (electricity)
• ICE—Internal combustion engine (transportation)
• ICT—Independent Coordinator of Transmission (US) (electricity)
  • —Information and Communication Technology
• IDC—Interchange Distribution Calculator (electricity)
• IEA—International Energy Agency (Paris)
• IEM—Internal electricity market (electricity)
• IEEE—Institute of Electrical and Electronics Engineers
• IEPE—Institute of Energy Policy and Economics (France)
• IER—Incremental Energy Rate
• IET—International emission trading (policy)
• IGCC—Integrated coal gasification combined cycle
• IGIC—Interim gas inventory charge (natural gas)
• IGSC—Interim gas supply charge (natural gas)
• IGT—Institute of Gas Technology (natural gas)
• IHR—Incremental Heat Rate- plant monitoring (electricity)
• IIASA—International Institute for Applied System Analysis
• IJC—International Joint Commission
• ILP—Integrated Licensing Process
• INGAA—Interstate Natural Gas Association of America
• IOS—Interconnected Operations Services (electricity)
• IOU—Investor owned utility (electricity)
• IPAA—Independent Petroleum Association of America (oil)
• IPCC—Intergovernmental Panel on Climate Change (climate)
• IPP—Independent Power Producer (electricity)
• IPS/UPS—Integrated Power System/United Power System, consisting of Independent Power Systems of 12 countries bordering Russia and the Unified Power System of Russia
• IROL—Interconnection Reliability Operating Limit (electricity)
• IRP—Integrated Resource Planning
• IRR—Internal Rate of Return (finance)
• ISO—Independent System Operator (US) (see also TSO) Responsible for grid management, but does not own assets. (electricity)
• ISO-NE—Independent System Operator of New England, a Regional Transmission Organization. (US) (electricity)
• ISO—NE ISO New England, Inc. (electricity)
• ISS—Interruptible Sales Service
• IT—Interruptible Transportation is gas shipment via pipeline whose delivery may be interrupted in favor of "firm shipment" contracts if there is lack of capacity. (natural gas)
• ITC—Investment tax credit (policy)
• ITS—"Interruptible Transportation Service" is gas shipment via pipeline whose delivery may be interrupted in favor of "firm shipment" contracts if there is lack of capacity. (natural gas)